Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
In a horizontal pincushion distortion correcting circuit using a parabolic wave signal of vertical deflection period for use with CRT drive circuit, a d.c. voltage proportional to vertical deflection period is produced, and then the parabolic wave signal is amplitude-modulated by the d.c. voltage so that a resultant parabolic wave signal has a substantially constant amplitude irrespective of the change in vertical sync frequency. The d.c. voltage may be produced by frequency-converting the vertical sync signal or by detecting an envelope of the horizontal deflection current modulated by the resultant parabolic wave signal.
patent: 4645985 (1987-02-01), Dietz
Blum Theodore M.
Victor Company of Japan Ltd.
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